<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>时间对象</title>
	<script type="text/javascript">
	//语法dateObject.getTime()
		// var d = new Date();
		// document.write(d.getTime() + "milliseconds since 1970/01/01");
		//获取从1970/01/01至今的毫秒数，并输出它。
		function startTime()
{
var today=new Date()
var h=today.getHours()
var m=today.getMinutes()
var s=today.getSeconds()
// add a zero in front of numbers<10
m=checkTime(m)
s=checkTime(s)
document.getElementById('txt').innerHTML=h+":"+m+":"+s
t=setTimeout('startTime()',500)
}

function checkTime(i)
{
if (i<10) 
  {i="0" + i}
  return i}
	</script>

</head>
<body onload="startTime()">
<div id="txt"></div>
	
</body>
</html>